<template>
      <div class="todo-footer">
        <label>
         <!--  <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
         <input type="checkbox" v-model="isAll">
        </label>
        <span>
          <span>已完成{{doneTotal}}</span> / 全部{{todos.length}}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
      </div>
</template>

<script>
export default {
name:'MyFooter',
props:['todos','checkAllTodo','clearAllTodo'],
computed:{
  //计算勾选的总数
  doneTotal(){
   return  this.todos.reduce((pre,current)=>{
      // console.log(pre,current);
        return  pre +(current.done ? 1:0);
    
   },0)
  },
  //控制全选框
  isAll:{
  get(){
    return this.doneTotal === this.todos.length && this.doneTotal>0
  },
  set(value){
    this.checkAllTodo(value);
  }
}
},
methods:{
/*   checkAll(e){
    this.checkAllTodo(e.target.checked);
  }, */
  clearAll(){
    this.clearAllTodo()
  }
}
}
</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>